Measurements of relative transition probabilities and the variation of the electronic transition moment for N2C3Πu-B3Πgsecond positive system

Hartmann, G.; Johnson, P. C.

doi:10.1088/0022-3700/11/9/013

Cited by 68 publications

(45 citation statements)

References 15 publications

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“…Emission lines of the second positive system (SPS) of N, and the first negative system (FNS) of N l account for more than 99% of the total emission intensity. Hartmann used the relative intensities of the SPS to determine transition probabilities that appeared to be in very good agreement with those determined by other methods [14]. This fact can be taken as proof of direct excitation of the C3n,-level of N,.…”

Section: Emission Spectroscopymentioning

confidence: 57%

Diagnostic techniques for atmospheric streamer discharges

Creyghton

Veldhuizen

Rutgers

1994

IEE Proceedings - Science, Measurement and Technology

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Section: Emission Spectroscopymentioning

confidence: 57%

Diagnostic techniques for atmospheric streamer discharges

Creyghton

Veldhuizen

Rutgers

1994

IEE Proceedings - Science, Measurement and Technology

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“…Nonintrusive optical emission spectroscopy of the discharge is commonly used to estimate the rotational temperature of molecular species in a discharge. In this paper, nitrogen band systems were studied because they can be easily identified in nitrogen carrying plasmas [23] and extensive reference data are available in the literature [17,[24][25][26][27]. Figure 8 shows the emission spectrum of nitrogen rovibronic band systems in the wavelength range from 365 to 395 nm, in the Mach 2.85 supersonic flow.…”

Section: Spectroscopic Measurementmentioning

confidence: 99%

Characterization of a Direct-Current Glow Discharge Plasma Actuator in Low-Pressure Supersonic Flow

et al. 2007

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An experimental study of a direct-current, nonequilibrium glow plasma discharge in the presence of a Mach 2.85 supersonic flow is presented. The discharge is generated with pinlike electrodes flush-mounted on a plane surface with sustaining currents between 25 to 300 mA. In the presence of a supersonic flow, two distinct discharge modes (diffuse and constricted) are observed depending on the flow and discharge operating conditions. The effect of the discharge on the flow ("plasma actuation") is characterized by the appearance of a weak shock wave in the vicinity of the discharge. The shock is observed at low powers (10 W) for the diffuse discharge mode but is absent for the higher power (100 W) constricted mode. High-speed laser schlieren imaging suggests that plasma actuation is rapid as it occurs on a time scale that is less than 220 s. Rotational (gas) and vibrational temperature within the discharge are estimated by emission spectral line fits of N 2 and N 2 rovibronic bands near 365-395 nm. The electronic temperatures are estimated by using the Boltzmann plot method for Fe(I) atomic lines. Rotational temperatures are found to be high (1500 K) in the absence of a flow but drop sharply (500 K) in the presence of a supersonic flow for both the diffuse and constricted discharge modes. The vibrational and electronic temperatures are measured to be about 3000 K and 1.25 eV, respectively, and these temperatures are the same with and without flow. The gas temperature spatial profiles above the cathode surface are similar for the diffuse and constricted modes indicating that dilatational effects due to gas heating are similar. However, complete absence of flow actuation as indicated visually by the shock indicates that electrostatic forces may also play an important role in high-speed plasma-flow actuation phenomena. Analytical estimates using cathode sheath theory indicate that ion pressure within sheath can be significant, resulting in gas compression within sheath and a corresponding expansion above it. The expansion, in turn, may fully negate the dilatational effect in the constricted case resulting in an apparent absence of forcing in the constricted case.

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“…E v ′ and E J ′ are vibrational state energy and rotational state energy. The more details can be found in references 20,22,24,25 . Fig.…”

Section: Methodsmentioning

confidence: 99%

Neutral gas temperature maps of the pin-to-plate argon micro discharge into the ambient air

Zhong

Majeed

2015

Physics of Plasmas

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This study is designed to explore the two dimensional temperature maps of the atmospheric argon discharge consisting of pin-to-plane electrodes supplied by a high voltage DC source. After checking the stability of the micro discharge, the two dimensional image plane focused by a quartz lens was scanned by the fiber probe driven by a 3D Mobile Platform. The rotational and vibrational temperatures are calculated using nitrogen emissions collected by the high resolution spectrometer and high sensitive intensified charge coupled device (ICCD). The rotational temperature varies from 1558.15 K to 2621.14 K and vibrational temperature varies from 3010.38 K to 3774.69 K, indicating a great temperature gradient due to small discharge size. The temperature maps show a lateral expansion and a sharp truncation in the radial direction. A double layers discharge is identified, where an arc discharge coats the glow discharge.

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Measurements of relative transition probabilities and the variation of the electronic transition moment for N₂C³Π_u-B³Π_gsecond positive system

Cited by 68 publications

References 15 publications

Diagnostic techniques for atmospheric streamer discharges

Diagnostic techniques for atmospheric streamer discharges

Characterization of a Direct-Current Glow Discharge Plasma Actuator in Low-Pressure Supersonic Flow

Neutral gas temperature maps of the pin-to-plate argon micro discharge into the ambient air

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